The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 08, 2005
Filed:
Jan. 21, 2003
Atsushi Ohido, Chuo-ku, JP;
Kenichi Tohchi, Chuo-ku, JP;
Kazuhito Yamasawa, Chuo-ku, JP;
Shinichiro Kakei, Chuo-ku, JP;
Atsushi Ohido, Chuo-ku, JP;
Kenichi Tohchi, Chuo-ku, JP;
Kazuhito Yamasawa, Chuo-ku, JP;
Shinichiro Kakei, Chuo-ku, JP;
TDK Corporation, Tokyo, JP;
Abstract
The invention relates to an optical device for polarizing light by changing its Faraday rotation angle, such as optical attenuators, optical switches or polarization controllers; and its object is to provide such an optical device which can be driven even by small-sized and power-saving magnetic circuits and in which the insertion loss in the Faraday rotator may be reduced. The optical device comprises a Faraday rotator formed of a garnet single crystal, and a magnetic circuit applying an external magnetic field H that is smaller than the saturation magnetic field Hs of the Faraday rotator to the Faraday rotator.